DATA-MANAGEMENT-FOUNDATIONS INSTANT ACCESS - DATA-MANAGEMENT-FOUNDATIONS TEST FEE

Data-Management-Foundations Instant Access - Data-Management-Foundations Test Fee

Data-Management-Foundations Instant Access - Data-Management-Foundations Test Fee

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WGU Data Management – Foundations Exam Sample Questions (Q19-Q24):

NEW QUESTION # 19
Which optional clause is used to reject inserts and updates that do not satisfy the WHERE clause of a view query?

  • A. WITH CHECK OPTION
  • B. MATERIALIZED VIEW
  • C. BASE TABLE
  • D. JOIN VIEWS

Answer: A

Explanation:
When a VIEW is created in SQL, users mayinsert or updatedata through that view. However, if a row is inserted or updated in such a way that itviolates the conditionof the VIEW's WHERE clause, it can lead to inconsistencies.
Topreventsuch unwanted modifications,SQL provides the WITH CHECK OPTION clause.
How WITH CHECK OPTION Works:
* Ensures thatany new data (INSERT/UPDATE) still fits within the defined constraints of the VIEW.
* If a user tries to insert or update a row that would not appear in the VIEW,the operation isrejected.
Example:
sql
CREATE VIEW HighSalaryEmployees AS
SELECT * FROM Employees WHERE Salary > 50000
WITH CHECK OPTION;
Now, if someone attempts:
sql
INSERT INTO HighSalaryEmployees (ID, Name, Salary)
VALUES (101, 'Alice', 30000);
Thisfailsbecause 30000 does not satisfy Salary > 50000.
Why Other Options Are Incorrect:
* Option B (Incorrect):JOIN VIEWS isnot a valid SQL clause.
* Option C (Incorrect):MATERIALIZED VIEW refers tostored viewsin some databases, but it doesnot reject incorrect inserts/updates.
* Option D (Incorrect):BASE TABLE refers to theoriginal table from which a VIEW is created.
Thus, the correct answer is WITH CHECK OPTION, whichensures that only valid data modifications occur.


NEW QUESTION # 20
Which description defines a data type?

  • A. It has a name and a varying set of rows.
  • B. It is a named set of values.
  • C. It has values corresponding to columns.
  • D. It is an unnamed tuple of values.

Answer: B

Explanation:
Adata typedefines the kind of data a column can store in a database. It ensures data consistency and efficient storage.
* Option A (Correct):A data type is anamed set of values, such asINTEGER, VARCHAR, DATE, etc.
* Option B (Incorrect):A tuple refers to arowin a relational database, not a data type.
* Option C (Incorrect):Data typesdefinecolumn values, but they do not correspond directly to columns.
* Option D (Incorrect):Data types do not have avaryingset of rows; they define attributes for columns.


NEW QUESTION # 21
What is the role of the database administrator?

  • A. The database administrator is responsible for securing the database system against unauthorized users.
  • B. The database administrator determines the format of each data element and the overall database structure.
  • C. The database administrator is a consumer of data in a database.
  • D. The database administrator develops computer programs that utilize a database.

Answer: A

Explanation:
ADatabase Administrator (DBA)is responsible for the management, security, and performance of a database system. This includes controlling access to data, ensuring database integrity, optimizing performance, managing backups, and protecting the system from unauthorized access.
* Option A (Incorrect):A DBA is not just a consumer of data but is primarily responsible for the database's management.
* Option B (Correct):Security is one of the key responsibilities of a DBA, including enforcing user access controls and implementing encryption and authentication mechanisms.
* Option C (Incorrect):While DBAs work with data structures, it is typically the role of adata architect ordatabase designerto define data formats and schema structures.
* Option D (Incorrect):Developing application programs that interact with the database is typically the role ofsoftware developersordatabase programmers, not DBAs.


NEW QUESTION # 22
What is the role of the transaction manager within the database system architecture?

  • A. The transaction manager is composed of a query processor, storage manager, transaction manager, log, and catalog.
  • B. The transaction manager translates the query processor instructions into filesystem commands and uses an index to quickly locate the requested data.
  • C. The transaction manager logs insert, update, and delete queries, and the result is sent back to the application.
  • D. The transaction manager uses information from the catalog to perform query optimization.

Answer: C


NEW QUESTION # 23
Which command is used to filter group results generated by the GROUP BY clause?

  • A. REPLACE
  • B. WHERE
  • C. HAVING
  • D. WITH

Answer: C

Explanation:
TheHAVINGclause is used in SQL to filtergrouped resultsgenerated by the GROUP BY clause. Unlike WHERE, which filters individual rowsbeforegrouping, HAVING filtersafter aggregationhas been performed.
Example Usage:
sql
SELECT Department, AVG(Salary) AS AvgSalary
FROM Employees
GROUP BY Department
HAVING AVG(Salary) > 50000;
* This query first groups employees by Department, calculates theaverage salary per department, and then filters onlythose departments where the average salary is greater than 50,000.
Why Other Options Are Incorrect:
* Option A (REPLACE) (Incorrect):Used for string substitution, not filtering.
* Option C (WITH) (Incorrect):Used inCommon Table Expressions (CTEs), not for filtering.
* Option D (WHERE) (Incorrect):Used forrow-level filtering before aggregation, but itcannot be used on aggregate functions like SUM() or AVG().
Thus,HAVING is the correct answerfor filtering after grouping.


NEW QUESTION # 24
......

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